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Monte-Carlo Simulations of Heavy Ions Track Structures and Applications
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Author and Affiliation:
Plante, Ianik(Universities Space Research Association, Houston, TX, United States);
Cucinotta, Francia A.(NASA Johnson Space Center, Houston, TX, United States)
Abstract: In space, astronauts are exposed to protons, high ]energy heavy (HZE) ions that have a high charge (Z) and energy (E), and secondary radiation, including neutrons and recoil nuclei produced by nuclear reactions in spacecraft walls or in tissue. The astronauts can only be partly shielded from these particles. Therefore, on travelling to Mars, it is estimated that every cell nucleus in an astronaut fs body would be hit by a proton or secondary electron (e.g., electrons of the target atoms ionized by the HZE ion) every few days and by an HZE ion about once a month. The risks related to these heavy ions are not well known and of concern for long duration space exploration missions. Medical ion therapy is another situation where human beings can be irradiated by heavy ions, usually to treat cancer. Heavy ions have a peculiar track structure characterized by high levels of energy ]deposition clustering, especially in near the track ends in the so ]called eBragg peak f region. In radiotherapy, these features of heavy ions can provide an improved dose conformation with respect to photons, also considering that the relative biological effectiveness (RBE) of therapeutic ions in the plateau region before the peak is sufficiently low. Therefore, several proton and carbon ion therapy facilities are under construction at this moment
Publication Date: Jun 03, 2013
Document ID:
20130013674
(Acquired Jun 17, 2013)
Subject Category: AEROSPACE MEDICINE
Report/Patent Number: JSC-CN-28823
Document Type: Conference Paper
Meeting Information: Computational and Theoretical Modeling of Biomolecular Interations; 3-8 Jun. 2013; Dubna; Russia
Meeting Sponsor: Joint Inst. for Nuclear Research; Dubna, Russian Federation
Academy of Sciences (Russia); Scientific Council on Biophysics; Moscow, Russian Federation
Lomonosov Moscow State Univ.; Moscow, Russian Federation
Academy of Sciences (Russia); Div. of Physico-Chemical Biology; Moscow, Russian Federation
Financial Sponsor: NASA Johnson Space Center; Houston, TX, United States
Organization Source: NASA Johnson Space Center; Houston, TX, United States
Description: 2p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: AEROSPACE MEDICINE; DEOXYRIBONUCLEIC ACID; HEAVY IONS; MONTE CARLO METHOD; PROTONS; RADIATION DAMAGE; RADIATION DOSAGE; RADIATION TRANSPORT; RADIOBIOLOGY; RELATIVE BIOLOGICAL EFFECTIVENESS (RBE)
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